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Quad Tip Sound for Your GT Fastback Without the Drone
The Thermal R&D B918-C918 is a complete 3 inch catback exhaust system built for the 2018 to 2023 Ford Mustang GT Fastback without the factory Active Exhaust valve system. Built from 304 stainless steel and finished with 4 inch quad angle cut tips, the B918-C918 delivers a deeper, more aggressive V8 note under throttle while True Helmholtz Technology keeps the cabin quiet and drone free at cruise.
Key Features
- Complete 3 inch catback exhaust system, part number B918-C918, for GT Fastback models without Active Exhaust
- 4 inch quad angle cut tips available in polished stainless (B918-C918) or ceramic coated black (B918-C918-C)
- True Helmholtz Technology cancels interior cabin drone at highway cruise
- 304 stainless steel construction throughout the B918-C918 system
- Direct bolt-on installation, no cutting or welding required
- Made in the USA and backed by a limited lifetime warranty
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2018-2023 | Ford | Mustang | GT Fastback (without Active Exhaust) |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | B918-C918 (polished) / B918-C918-C (ceramic coated) |
| Brand | Thermal R&D |
| System Type | Catback exhaust |
| Pipe Diameter | 3 inch throughout |
| Material | 304 stainless steel, mandrel bent |
| Tip Size | 4 inch quad angle cut |
| Tip Finish | Polished stainless (B918-C918) or ceramic coated black (B918-C918-C) |
| Drone Elimination | True Helmholtz Technology |
| Active Exhaust Compatibility | Not compatible, does not support OEM active valve exhaust |
| Body Style | Fastback only, does not fit convertible |
| Country of Manufacture | USA |
| Warranty | Limited lifetime warranty to original owner |
What's Included
- Complete B918-C918 catback exhaust system with muffler and quad tips
- All clamps and hardware required for a direct bolt-on B918-C918 install
- Written installation instructions
About Thermal R&D
Thermal R&D builds every exhaust system in Lancaster, California, and the B918-C918 for the Mustang GT applies the same True Helmholtz Technology used across the Thermal R&D lineup so owners get a bigger V8 sound without a droning cabin on the highway. The B918-C918 is backed by a limited lifetime warranty to the original vehicle owner.
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FAQ
What is the B918-C918?The B918-C918 is a Thermal R&D 3 inch catback exhaust system for the 2018 to 2023 Ford Mustang GT Fastback without Active Exhaust, finished with 4 inch quad angle cut polished tips.
Will the B918-C918 fit a Mustang GT with factory Active Exhaust?No. The B918-C918 is built for GT Fastback models without the factory Active Exhaust valve system. It is not designed to work with the OEM active valve setup.
Does the B918-C918 fit the Mustang GT convertible?No. The B918-C918 is designed specifically for the Fastback body style and does not fit convertible Mustangs.
What is the difference between B918-C918 and B918-C918-C?Both are the same 3 inch catback system. The B918-C918 has polished stainless quad tips, while the B918-C918-C has ceramic coated black quad tips.
Does installing the B918-C918 require cutting or welding?No. The B918-C918 is a direct bolt-on system that uses the factory hanger locations, so no cutting or welding is needed.
Will the B918-C918 trigger a check engine light?No. The system connects behind the factory catalytic converters and does not affect any emissions sensors.
Does the B918-C918 come with a warranty?Yes. Thermal R&D backs the B918-C918 with a limited lifetime warranty to the original vehicle owner against manufacturing defects.
How long does the B918-C918 take to install?Most installers complete the B918-C918 swap in about two hours with a lift and basic hand tools.
Install Instructions
- Raise the Mustang GT safely and allow the factory exhaust to cool completely before starting the B918-C918 install.
- Disconnect the factory exhaust at the mid pipe connection and remove the stock muffler section from its hangers.
- Remove the factory exhaust tips and muffler assembly from the vehicle.
- Position the B918-C918 muffler section onto the factory hanger locations without fully tightening clamps.
- Connect the B918-C918 muffler inlet to the factory mid pipe using the provided clamp.
- Align the B918-C918 quad tips so they sit level and centered in the rear valance opening.
- Torque every B918-C918 clamp to spec once alignment is confirmed.
- Start the engine and check all B918-C918 connections for leaks before lowering the vehicle.
Prop 65 Warning
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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